A False Killer Whale is a small, entirely black delphinid. It has no beak and the head slopes gradually from tip of snout to the blowhole. The dorsal fin is small, narrow, placed slightly forward of midpoint of the back and directed backward. Pectoral fins are small (about one-eighth of total length and tapering). Adult males reach a length of 5.7 m; females, 4.9 m.